The EBC 2011-2016 BMW Z4 3.0L Twin Turbo Is (E89) RK Series Premium Front Rotors are a high-performance replacement rotor set designed for use with the BMW Z4 3.0L Twin Turbo Is (E89). These rotors are made from a high-grade cast iron construction and feature a unique curved slot design that helps improve brake pad bite and reduce brake noise. The rotors also feature a black anodized finish to help resist corrosion and provide a long-lasting, stylish look. This set of rotors is perfect for those looking to upgrade their Z4's braking performance and style.